EFFECT OF POLYMERIC (POLYAMIDE) GROUT INJECTION ON IMPROVEMENT OF COMPRESSIVE STRENGTH AND ELASTIC MODULUS OF GROUTED SAND

摘要

The main objective of this laboratory project is to investigate the effectiveness of using polyamiderngrout injection on sand improvement. Soil samples with different dry densities in their loose, mediumrnand dense state (cylindrical shaped) with 5cm diameter and 10cm height are subjected to polyamiderninjection. In order to investigate the grout injection effect on soil's strength, the specimens arernsubjected to one dimensional unconfined compression tests. We know that polyamide doesn’t mixrnwith water and we should mix it with citric acid. It has been observed that by increasing the polymerrnpercent in polymer-water-citric acid mixture grout, the soil compressive strength and elastic modulusrnhas been improved significantly. In general denser sands presented higher compressive strength andrnelastic modulus in comparison with looser ones in same polymer percents.